PMID: 15237800Jul 9, 2004Paper

Quantifying elasticity and viscosity from measurement of shear wave speed dispersion

The Journal of the Acoustical Society of America
Shigao ChenJ F Greenleaf

Abstract

The propagation speed of shear waves is related to frequency and the complex stiffness (shear elasticity and viscosity) of the medium. A method is presented to solve for shear elasticity and viscosity of a homogeneous medium by measuring shear wave speed dispersion. Harmonic radiation force, introduced by modulating the energy density of incident ultrasound, is used to generate cylindrical shear waves of various frequencies in a homogeneous medium. The speed of shear waves is measured from phase shift detected over the distance propagated. Measurements of shear wave speed at multiple frequencies are fit with the theoretical model to solve for the complex stiffness of the medium. Experiments in gelatin phantoms show promising results validated by an independent method. Practical considerations and challenges in possible medical applications are discussed.

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Citations

Oct 29, 2010·Nature Communications·Roozbeh GhaffariDennis M Freeman
Sep 18, 2009·Physics in Medicine and Biology·M W Urban, J F Greenleaf
Mar 16, 2011·Physics in Medicine and Biology·Ivan Z NenadicJames F Greenleaf
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Apr 6, 2013·Medical Physics·Chih-Chung HuangCho-Chiang Shih
Jan 10, 2012·The Journal of the Acoustical Society of America·Ivan Z NenadicJames F Greenleaf
Jan 10, 2012·The Journal of the Acoustical Society of America·Thomas J RoystonRichard L Magin
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Jun 8, 2013·The Journal of the Acoustical Society of America·Siavash Kazemirad, Luc Mongeau
Sep 11, 2009·The Journal of the Acoustical Society of America·Ali BaghaniRobert Rohling
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